What began as a simple boarding dispute at Miami International Airport escalated into a tour de force of plane drama Sunday as a belligerent passenger was repeatedly stunned by police, forcibly carried out of his seat, then driven through the terminal with his head hanging out the back of a golf cart like a man in a stockade. And all that was before, police say, Jacob Garcia lunged for an officer’s gun and kicked out a squad car window. Better start at the beginning. Garcia, 28, with a handlebar mustache whose precise curls somehow survived the exertions to come, boarded the American Airlines flight around 9 p.m., bound for his hometown of Chicago. But before the plane could leave the airport in Miami, police wrote in their report, a seatmate accused Garcia of touching her without her permission.